1243154057 has 4 divisors (see below), whose sum is σ = 1243237380. Its totient is φ = 1243070736.

The previous prime is 1243154041. The next prime is 1243154069. The reversal of 1243154057 is 7504513421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7504513421 = 67 ⋅112007663.

It can be written as a sum of positive squares in 2 ways, for example, as 225480256 + 1017673801 = 15016^2 + 31901^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243154057 - 2⁴ = 1243154041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243150057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12458 + ... + 51395.

It is an arithmetic number, because the mean of its divisors is an integer number (310809345).

Almost surely, 2^1243154057 is an apocalyptic number.

It is an amenable number.

1243154057 is a deficient number, since it is larger than the sum of its proper divisors (83323).

1243154057 is an equidigital number, since it uses as much as digits as its factorization.

1243154057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83322.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 1243154057 is about 35258.3898809914. The cubic root of 1243154057 is about 1075.2471923344.

Adding to 1243154057 its reverse (7504513421), we get a palindrome (8747667478).

The spelling of 1243154057 in words is "one billion, two hundred forty-three million, one hundred fifty-four thousand, fifty-seven".